*jaw drops* one word about SC2: WOW!!!
One good thing about this game is the characters. They are simply put, amazing. You start out with a few characters such as Talim, Cassandra, Mitsurugi, and others, and of course, as you progress through the weapons master mode, you not only unlock characters, but also weapons for characters as well, which is a VERY useful and rather cool addition.
The sound of the game is amazing. You get very cool songs and background music that really allow you to get involved in the game. Some levels more than others.
The story mode is lacking somewhat, there's not much to do with the actual battle between Soul Edge and Soul Calibur until you get to the destined battle and the fight with Inferno. But in Weapons Master it's almost all about that, which can get kinda confusing.
And then there's the multiplayer, it's got an amazing system of battle, where characters slash the crap out of each other, with no sustaining effects, until one gets knocked out, or ko'd.
This is unarguably one of the best games I've ever played, but the story mode is a little lacking. So I'd buy it, but get a LOT of practice, you're gonna need it for later on in weapons master.